Dear lord, how I have grown! Green terror and gold saum are made up names to sell fish. Much better to use scientific names to identify fish.
I agree, I prefer calling them rivulatus and staslbergi, especially vs. the whole true/false thing, which I find annoying. Aside from the problem of sometimes confusing or misidentifying fish within a genus, I don't get overly bent out of shape over common names as a shorthand for some fish. You can call a gibberosa a frontosa, a Heros species a severum, or both rivulatus and stalsbergi a green terror if you like, but the "true" and "false" thing is contrived and artificial imo. If there's something special about stalsbergi it's that they're less common. It's a matter of taste or preference or having something different, not true or false.
Similar with gold suam, white saum, silbersaum-- gold seam, white seam, silver seam. I realize a lot of people like to use the German vs. the English, but it's not more official. They're descriptive hobby nicknames, not taxonomic names, not even taxonomic synonyms.
I get the more common vs. less common factor with rivulatus vs. stalsbergi, but my take on it is if stalsbergi had been the common fish all along and orange seam rivulatus was new to the hobby and you rarely saw them, 'gold saum' rivulatus would be a holy grail fish these days, like they were when they first showed up in the 70s. True, false, or otherwise.
